Preview (5 of 15 cards)
What is an acid?
A substance that tastes sour, turns blue litmus red, and has pH less than 7
What is a base?
A substance that tastes bitter, feels soapy, turns red litmus blue, and has pH more than 7
What is an alkali?
A base that dissolves in water. e.g. NaOH, KOH, Ca(OH)₂
What is a neutral substance?
A substance that is neither acidic nor basic — pH equal to 7. e.g. water
What is an indicator?
A substance that changes colour in acidic or basic solutions to show nature of solution
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